Fire in the Everglades, Alexx in danger, homemade buckshot, serial killer on the loose, possible child molester - it's all here in one of the more complex episodes in ages.

It begins with a corpse that a crocodile's (alligator??? never sure) not too keen to let go of. Alexx and Eric finally get the body only to be stuck as an explosion sparks a freak fire all around them. And that's just the opening.

The episode has more twists and turns than normal even for CSI. As prisoners are drafted in to help fight the fire and one is killed, things take a sinister turn, especially when one of the prisoners isn't who he's supposed to be. Turns out another guy has swapped wristbands and sent said serial killer on a mission to kill the guy who raped his nine-year old son.

Meanwhile two college kids are shot whilst supposedly trying to buy hooch from a still run by two cast members from the remake of Deliverance. Calleigh once again gets to have a lot of fun with guns and buckshot to reveal some new evidence.

And the delicious Alexx is in big trouble, held hostage and forced to help a killer. At last Khandi Alexander gets a meatier role than the usual talking to the corpse stuff and she obviously relishes it.

As if all this going on wasn't enough, Madison, son of Ray Caine suddenly is stuck down with leukemia and needs a bone marrow donor. Step up Horatio, who takes his glasses off long enough to find out he's not a match. So will all have to be revealed to Yelena?

Because it's a longer episode than normal, it gives the writers, director and actors the chance to have more scope, and this they take on with a vengeance. The ending is a very James Bondian-like chase through the Everglades on those little fan boat things (I'm sure they have a name, but I'm English - we're lucky if we have pedalos). A shoot out on the water, with helicopters and all manner of angle shots of the action.

Again the only downside is Caruso's refusal to talk normally. Not everything one says in life is full of import, but he'd read the reheat instructions on a ready meal as though he were talking a plane down.

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